/**
 * A Shift represents a duration of time during which an 
 * employee is scheduled to work.  A shift is 
 * associated with a particular job skill which someone
 * is required to have before they can work this shift.
 * A shift can be filled by at most one employee.
 *
 * <p><i>Note to students: Suggested javadoc command options are:</i><br>
 * <code>-verbose -author -version  -private -nohelp -nodeprecated
 * -linksource -windowtitle </code>
 *
 * @author  John Dalbey
 * @version 1.0       - June 07, 2001
 */

public class Shift implements Serializable
{
   //  -- DATA MEMBERS --

   /**
     * The time this shift is scheduled to begin. 
     */
    private Time startTime;

   /**
     * The time this shift ends. 
     */
    private Time endTime;

    /**
     * The kind of job skill someone must possess in order to be 
     * qualified to work during this shift. 
     */
    private Skill shiftSkill;

    /**
     * Who has been assigned to work during this shift. 
     */
    private Employee assignedEmployee;

    /**
     * Indicates whether or not anyone has been assigned to this shift.
     */
    private boolean isFilled;

    //  -- METHODS --

    /**
     * Construct a shift from starting and ending times.
     *
     * @param startTime the time this shift starts
     * @param endtime   the time this shift ends
     */
    public Shift(Time startTime, Time endTime)
    {
    }


    /**
     * Return whether or not this shift has been assigned an employee.
     *
     * @return <code>true</code> if this shift is filled, 
     *         <code>false</code> otherwise.
     */
    public boolean isFilled()
    {
        return isFilled;               
    }


    /**
     * Determines how many hours are in this shift. 
     *
     * @return The number of hours in this shift, rounded up to the
     *         nearest integer.<br>
     * <b>Pre:</b> endtime >= starttime
     */
    public int durationOf()
    {
    }


    /**
     * Associates a job skill with this shift.
     *
     * @param aSkill the skill that someone is required to have in order
     *               to work this shift.
     */
    public void setSkill(Skill aSkill)
    {
    }

    /**
     * Gets the skill associated with this shift.
     *
     * @return the skill associated with this shift
     */
    public Skill getSkill()
    {
    }

    /**
     * Assigns an employee to this shift.
     *
     * @param person the employee who is to work during this shift<br>
     * <b>Pre:</b> This shift has a skill associated with it.<br>
     * <b>Post:</b> This shift is filled.
     * @throws WrongSkillException if the employee doesn't have
     *         the skill needed for this shift.
     */
    public void setEmployee(Employee person) throws WrongSkillException
    {
    }

    /**
     * Gets the employee who is assigned to work this shift.
     *
     * @return the employee who is assigned to work this shift
     */
    public Employee getEmployee()
    {
    }

}